# How to calculate relative humidity with temperature and dew point? [duplicate]

I got this formula for calculating-

100x(EXP.((17.625x32)/(243.04+32)/EXP.((17.625x54)/(243.04+54)))=?

The answer should be 43, but I Keep getting 65. Please, can anyone calculate this correctly?

Thank You!

• Thanks, but no since I got the right formula, but I am having trouble doing math. I really need help to calculate with correct steps to get 43.
– Rena
Commented Oct 4, 2021 at 15:51
• I get 64. Are you sure you have the equation correct?
– Fred
Commented Oct 4, 2021 at 16:51
• Yes, the equation is correct. I use Exponential function incorrectly. I know that it is 2.71828 constant, but still get the wrong answer.
– Rena
Commented Oct 4, 2021 at 17:25
• @Jean I think the best link would really be this one Commented Oct 4, 2021 at 18:49
• @Rena the goal of the site is to provide one's learning for the next person to benefit from. So if it was something useful, perhaps post it as an answer here or on the Relative Humidity approximation from Dew Point and Temperature question so others can benefit. Generally questions with a user-centric bug is being made get closed and no answers because they aren't of use to a larger group... but I tried to be of help. Seems the least you could do is tell us what changed :) Commented Oct 5, 2021 at 2:18